309 lines
10 KiB
Python
Executable File
309 lines
10 KiB
Python
Executable File
#!/usr/bin/env python
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#
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# auto-deploy script for https://develop.element.io
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#
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# Listens for buildkite webhook pokes (https://buildkite.com/docs/apis/webhooks)
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# When it gets one, downloads the artifact from buildkite
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# and deploys it as the new version.
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#
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# Requires the following python packages:
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#
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# - requests
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# - flask
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#
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from __future__ import print_function
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import json, requests, tarfile, argparse, os, errno
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import time
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import traceback
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from urlparse import urljoin
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import glob
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import re
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import shutil
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import threading
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from Queue import Queue
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from flask import Flask, jsonify, request, abort
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from deploy import Deployer, DeployException
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app = Flask(__name__)
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deployer = None
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arg_extract_path = None
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arg_symlink = None
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arg_webhook_token = None
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arg_api_token = None
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workQueue = Queue()
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def create_symlink(source, linkname):
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try:
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os.symlink(source, linkname)
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except OSError, e:
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if e.errno == errno.EEXIST:
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# atomic modification
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os.symlink(source, linkname + ".tmp")
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os.rename(linkname + ".tmp", linkname)
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else:
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raise e
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def req_headers():
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return {
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"Authorization": "Bearer %s" % (arg_api_token,),
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}
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# Buildkite considers a poke to have failed if it has to wait more than 10s for
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# data (any data, not just the initial response) and it normally takes longer than
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# that to download an artifact from buildkite. Apparently there is no way in flask
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# to finish the response and then keep doing stuff, so instead this has to involve
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# threading. Sigh.
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def worker_thread():
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while True:
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toDeploy = workQueue.get()
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deploy_buildkite_artifact(*toDeploy)
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@app.route("/", methods=["POST"])
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def on_receive_buildkite_poke():
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got_webhook_token = request.headers.get('X-Buildkite-Token')
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if got_webhook_token != arg_webbook_token:
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print("Denying request with incorrect webhook token: %s" % (got_webhook_token,))
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abort(400, "Incorrect webhook token")
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return
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required_api_prefix = None
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if arg_buildkite_org is not None:
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required_api_prefix = 'https://api.buildkite.com/v2/organizations/%s' % (arg_buildkite_org,)
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incoming_json = request.get_json()
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if not incoming_json:
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abort(400, "No JSON provided!")
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return
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print("Incoming JSON: %s" % (incoming_json,))
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event = incoming_json.get("event")
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if event is None:
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abort(400, "No 'event' specified")
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return
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if event == 'ping':
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print("Got ping request - responding")
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return jsonify({'response': 'pong!'})
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if event != 'build.finished':
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print("Rejecting '%s' event")
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abort(400, "Unrecognised event")
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return
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build_obj = incoming_json.get("build")
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if build_obj is None:
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abort(400, "No 'build' object")
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return
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build_url = build_obj.get('url')
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if build_url is None:
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abort(400, "build has no url")
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return
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if required_api_prefix is not None and not build_url.startswith(required_api_prefix):
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print("Denying poke for build url with incorrect prefix: %s" % (build_url,))
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abort(400, "Invalid build url")
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return
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build_num = build_obj.get('number')
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if build_num is None:
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abort(400, "build has no number")
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return
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pipeline_obj = incoming_json.get("pipeline")
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if pipeline_obj is None:
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abort(400, "No 'pipeline' object")
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return
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pipeline_name = pipeline_obj.get('name')
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if pipeline_name is None:
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abort(400, "pipeline has no name")
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return
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artifacts_url = build_url + "/artifacts"
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artifacts_resp = requests.get(artifacts_url, headers=req_headers())
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artifacts_resp.raise_for_status()
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artifacts_array = artifacts_resp.json()
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artifact_to_deploy = None
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for artifact in artifacts_array:
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if re.match(r"dist/.*.tar.gz", artifact['path']):
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artifact_to_deploy = artifact
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if artifact_to_deploy is None:
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print("No suitable artifacts found")
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return jsonify({})
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# double paranoia check: make sure the artifact is on the right org too
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if required_api_prefix is not None and not artifact_to_deploy['url'].startswith(required_api_prefix):
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print("Denying poke for build url with incorrect prefix: %s" % (artifact_to_deploy['url'],))
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abort(400, "Refusing to deploy artifact from URL %s", artifact_to_deploy['url'])
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return
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# there's no point building up a queue of things to deploy, so if there are any pending jobs,
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# remove them
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while not workQueue.empty():
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try:
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workQueue.get(False)
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except:
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pass
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workQueue.put([artifact_to_deploy, pipeline_name, build_num])
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return jsonify({})
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def deploy_buildkite_artifact(artifact, pipeline_name, build_num):
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artifact_response = requests.get(artifact['url'], headers=req_headers())
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artifact_response.raise_for_status()
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artifact_obj = artifact_response.json()
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# we extract into a directory based on the build number. This avoids the
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# problem of multiple builds building the same git version and thus having
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# the same tarball name. That would lead to two potential problems:
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# (a) sometimes jenkins serves corrupted artifacts; we would replace
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# a good deploy with a bad one
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# (b) we'll be overwriting the live deployment, which means people might
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# see half-written files.
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build_dir = os.path.join(arg_extract_path, "%s-#%s" % (pipeline_name, build_num))
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try:
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extracted_dir = deploy_tarball(artifact_obj, build_dir)
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except DeployException as e:
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traceback.print_exc()
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abort(400, e.message)
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create_symlink(source=extracted_dir, linkname=arg_symlink)
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def deploy_tarball(artifact, build_dir):
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"""Download a tarball from jenkins and unpack it
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Returns:
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(str) the path to the unpacked deployment
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"""
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if os.path.exists(build_dir):
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raise DeployException(
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"Not deploying. We have previously deployed this build."
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)
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os.mkdir(build_dir)
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print("Fetching artifact %s -> %s..." % (artifact['download_url'], artifact['filename']))
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# Download the tarball here as buildkite needs auth to do this
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# we don't pgp-sign buildkite artifacts, relying on HTTPS and buildkite
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# not being evil. If that's not good enough for you, don't use develop.element.io.
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resp = requests.get(artifact['download_url'], stream=True, headers=req_headers())
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resp.raise_for_status()
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with open(artifact['filename'], 'wb') as ofp:
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shutil.copyfileobj(resp.raw, ofp)
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print("...download complete. Deploying...")
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# we rely on the fact that flask only serves one request at a time to
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# ensure that we do not overwrite a tarball from a concurrent request.
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return deployer.deploy(artifact['filename'], build_dir)
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if __name__ == "__main__":
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parser = argparse.ArgumentParser("Runs a Vector redeployment server.")
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parser.add_argument(
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"-p", "--port", dest="port", default=4000, type=int, help=(
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"The port to listen on for requests from Jenkins."
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)
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)
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parser.add_argument(
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"-e", "--extract", dest="extract", default="./extracted", help=(
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"The location to extract .tar.gz files to."
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)
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)
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parser.add_argument(
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"-b", "--bundles-dir", dest="bundles_dir", help=(
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"A directory to move the contents of the 'bundles' directory to. A \
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symlink to the bundles directory will also be written inside the \
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extracted tarball. Example: './bundles'."
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)
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)
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parser.add_argument(
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"-c", "--clean", dest="clean", action="store_true", default=False, help=(
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"Remove .tar.gz files after they have been downloaded and extracted."
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)
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)
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parser.add_argument(
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"-s", "--symlink", dest="symlink", default="./latest", help=(
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"Write a symlink to this location pointing to the extracted tarball. \
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New builds will keep overwriting this symlink. The symlink will point \
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to the /vector directory INSIDE the tarball."
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)
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)
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# --include ../../config.json ./localhost.json homepages/*
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parser.add_argument(
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"--include", nargs='*', default='./config*.json', help=(
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"Symlink these files into the root of the deployed tarball. \
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Useful for config files and home pages. Supports glob syntax. \
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(Default: '%(default)s')"
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)
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)
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parser.add_argument(
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"--test", dest="tarball_uri", help=(
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"Don't start an HTTP listener. Instead download a build from Jenkins \
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immediately."
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),
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)
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parser.add_argument(
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"--webhook-token", dest="webhook_token", help=(
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"Only accept pokes with this buildkite token."
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), required=True,
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)
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parser.add_argument(
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"--api-token", dest="api_token", help=(
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"API access token for buildkite. Require read_artifacts scope."
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), required=True,
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)
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# We require a matching webhook token, but because we take everything else
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# about what to deploy from the poke body, we can be a little more paranoid
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# and only accept builds / artifacts from a specific buildkite org
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parser.add_argument(
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"--org", dest="buildkite_org", help=(
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"Lock down to this buildkite org"
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)
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)
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args = parser.parse_args()
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arg_extract_path = args.extract
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arg_symlink = args.symlink
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arg_webbook_token = args.webhook_token
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arg_api_token = args.api_token
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arg_buildkite_org = args.buildkite_org
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if not os.path.isdir(arg_extract_path):
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os.mkdir(arg_extract_path)
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deployer = Deployer()
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deployer.bundles_path = args.bundles_dir
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deployer.should_clean = args.clean
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for include in args.include:
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deployer.symlink_paths.update({ os.path.basename(pth): pth for pth in glob.iglob(include) })
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if args.tarball_uri is not None:
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build_dir = os.path.join(arg_extract_path, "test-%i" % (time.time()))
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deploy_tarball(args.tarball_uri, build_dir)
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else:
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print(
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"Listening on port %s. Extracting to %s%s. Symlinking to %s. Include files: %s" %
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(args.port,
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arg_extract_path,
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" (clean after)" if deployer.should_clean else "",
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arg_symlink,
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deployer.symlink_paths,
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)
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)
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fred = threading.Thread(target=worker_thread)
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fred.daemon = True
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fred.start()
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app.run(port=args.port, debug=False)
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